It appears to be a hard drive problem.
cronus services went down Saturday evening June 11, 2011. The affected services included DNS, NIS, time and using EECS Windows Active Directory passwords for IRIS ldap authentication.
UPDATE
[2011-06-16 09:28:01 | Mark Kraitchman]
A work-around was put in place to
restore the using EECS Windows Active
Directory passwords for IRIS ldap authentication
service during the morning of
Monday June 13, 2011.
cronus was brought back up with a new
clean operating system on replacement
hard drives. DNS and time services
resumed during the afternoon of
Wednesday June 15, 2011.
NIS services resumed Thursday June 16, 2011.
Some system administration tasks remain
to be performed on cronus.
The ldap directory servers and windows active
directory servers dependence on DNS support from
cronus for EECS Windows Active Directory password
being used for IRIS ldap authentication has not
been fully investigated and has not been
properly configured to be more robust yet.
Resolved as of 2011-06-16 09:25:00